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x^4-y^4
=(x^2+y^2)(x^2-y^2)
=(x^2+y^2-2xy+2xy)(x+y)(x-y)
=[(x+y)^-2xy)(x+y)(x-y)
=[4^2-2(2+√3)(2-√3)]*4*2√3
=14*4*2√3
=122√3
=(x^2+y^2)(x^2-y^2)
=(x^2+y^2-2xy+2xy)(x+y)(x-y)
=[(x+y)^-2xy)(x+y)(x-y)
=[4^2-2(2+√3)(2-√3)]*4*2√3
=14*4*2√3
=122√3
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